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Product # 3321

  • 2-1/16" (52.4mm)
  • Mechanical Mechanical
  • 0-100 PSI
  • Incandescent
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The life blood of your engine, a lack of oil pressure is one of the most catastrophic scenarios that can happen. Knowing the precise pressure is critical to both its longevity and performance, as well as your peace of mind. AutoMeter’s Mechanical Oil Pressure Gauge utilizes the most advanced bourdon tube meter movement on the market to deliver accuracy and durability you won’t find anywhere else. A simple 1/8” NPT connection makes installation easy. Fittings and nylon tube are included and optional braided stainless line kits are available.

Feature Points

  • Traditional incandescent lighting illuminates around the perimeter of the dial
  • AutoMeter’s race proven mechanical instruments provide trusted accuracy while being simple to install
  • No electrical system required for gauge operation - compatible with every street or race vehicle
  • Mechanical movements provide accuracy and durability even in the harshest environments
  • Gauge kit includes 1/8” nylon line, 1/8” NPT compression fittings, 1/4” NPT adapter, bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation


  • 1/8" NPT Male to 1/8" compression fitting, 1/8" NPT Female to 1/8" compression fitting, 1/8" NPT to 1/4" NPT bushing


  • 10 ft. nylon tubing

Bulb & Socket

  • 3220

Light Covers

  • Red 3214 & Green 3215

Mounting Hardware

  • 2230
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does it come with install kit and if so how ling is the tubing

Asked by: PeteM
Thank you for your inquiry. The 3321 does come with an installation kit, which includes a 10 foot nylon tube.
Answered by: Jim from AutoMeter
Date published: 2019-10-11

Can the nylon tubing be replaced with a braided steel line. Is the tubing attached to the gauge if so will if damaged the gauge if replaced?

Asked by: Diesel D
Thank you for your question. Yes, you can replace the tubing with braided steel line. The line is not integrated into the back of the gauge, there is just a fitting it attaches to on the back of the gauge.
Answered by: Zach from AutoMeter
Date published: 2019-06-13

I lost the hardware to the 3321 oil gauge. Do you have a part number for it.

Asked by: ronche86
Thank you for your question. The hardware is part #3226.
Answered by: Zach from AutoMeter
Date published: 2019-04-05

Hi I have a 3327 but at hot idle hard to read pressure, hooked up old mechanical and read better.  Have Sensor on braided line, while this won’t match short sweeps is it more dependable and readable at hot idle when pressure is low in the 15 psi range?  

Asked by: Mwilson904
Hi there, thank you for reaching out to us. Due to the nature of the dial resolution on a mechanical gauge, it will give a more precise reading at low pressure. However, on an electric, especially with a sender remotely mounted on a braided line, make sure there is a good ground for the sender. Normally, when installed directly into the engine, the threads of the sender make the connection between sender and ground. Any additional resistance introduced from a poorly grounded sender will give a lower reading on the gauge.
Answered by: Matt from AutoMeter
Date published: 2018-12-29
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